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Geodesy

Geodesy

Planetary Coordinate Reference Systems

The Moon With the passing of the 50-year anniversary of the first Apollo Moon Landing, we wanted to visit our only natural satellite and explore the coordinate systems utilised for lunar exploration and navigation. There is an interesting but perhaps little-used folder of *.prj files called “Solar System” in ArcGIS Desktop. Read more…

By geospatial, 2 years2 years ago
Geodesy

Checklist: Adding coordinate values from a spreadsheet

Perhaps one of the most common queries concerning data import into any geospatial software regards the correct plotting of coordinate values from spreadsheets. This post provides a checklist that hopefully will encourage the understanding of coordinate values, the implications of how they are managed and the relationship to coordinate reference systems Read more…

By geospatial, 2 years2 years ago
Geodesy

GGspatial in Geomatics World Magazine

Geomatics World has published, in their September/October 2018 issue, an article, written by Simon Kettle, on how the European datum of 1950 came about and how it became the de facto standard after World War II. Read the article in Geomatics World magazine by following this link.

By geospatial, 3 years3 years ago
ArcGIS Pro

Creating Geodesics in ArcGIS Pro

In a previous blog I mentioned how ArcGIS Pro did not have the functionality to create geodesic lines. Well there is an add-in available for that now and it can be used in ArcGIS Pro 1.4 – 2.0 as well as in ArcMap and ArcGIS Web AppBuilder. It is free Read more…

By geospatial, 3 years3 years ago
ArcGIS Pro

Geodesic distances: How long is that line again?

What are Geodesic distances? A geodesic line is the shortest path between two points on a curved surface, like the Earth. They are the analogue of a straight line on a plane surface or whose sectioning plane at all points along the line remains normal to the surface. It is a way of showing Read more…

By geospatial, 3 years3 years ago
Geodesy

The Vertical Datum: Or is that Mean Sea level?

What is a Vertical Datum? The Geodetic Glossary (2009) defines height as ‘distance, measured along a perpendicular, between a point and a reference surface’. This definition is concise and direct but leaves a vagueness concerning the reference surface. This reference surface is the Vertical Datum. A datum is required to reach accurate and reliable Read more…

By geospatial, 3 years3 years ago
Geodesy

Distance on a sphere: The Haversine Formula

I decided to look into some of the mathematics that makes it possible to calculate distances considering 3D space, for example, calculating distance on a sphere. The Earth is round but big so we can consider it flat for short distances. But, even though the circumference of the Earth is Read more…

By geospatial, 3 years3 years ago
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